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I figured it out. keys = [k1, k2, ... , k20] def encrypt(offset, message): ctext = [] for i in len(message): ctext[i] = keys[(offset + i) % len(keys)] ^ message[i] The "rotation" is caused by the "offset" parameter. The keys are stored in a rotation buffer and xored with plaintext bytes. The keys can be obtained by xoring a plaintext with a ...

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